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Excessive drinking in older corgi

First off this is an otherwise healthy dog who has had isolated health issues in the past including a near death experience following ingestion of rat poison, which was 5 years ago. In the last 6 months one of our 10 year old corgis has started drinking an unbelievable amount of water. She stands and drinks so long that it is noticeable. Obviously her output has also increased with input to the point where she used to be happy to pee 3 times a day (although offered many more opportunities) to needing to go outside every 30 minutes unless she is in her crate.

I am aware this sounds like a UTI and at first it was. She was seen by the vet and did a double round of antibiotics because the drinking symptom persisted. Her urine is now fine. She has also been tested for Addison's and Cushings both of which she does not have. It has gotten to the point that we speak to the vet multiple times a week, drop off urine at least once a week and she is seen around once every 2 weeks. Obviously this method is VERY cost effective, ha.

As such we are all pretty obviously stumped. Her sense of urgency that came with the UTI is gone but she will simply go into another room and pee if not let out consistently. So at this point suggestions from the peanut gallery are welcome!

What are you feeding her? We had this with my old collie, after ruling out everything and I mean everything, we switched her to canned food for several months. The over drinking stopped. I have no clue why, though. She was hypothyroid too, but I can't recall which came first.

She eats the same food she's been on for years - Prarie. That is a good thought though.

She did have the ACTH test. I do not think she had the other although she did spend the day at the vet that day. She also is suspiciously lacking in all other Cushing symptoms that we went over with the vet. She has had her renal function and bloodwork done - multiple times - during this ordeal. The vet has also suggested diabetes and we thought they had done that test but she recently suggested we test for it so perhaps there was a miscommunication. We have not done an ultrasound. I am assuming we haven't because of normal abdominal palpations and the normal bloodwork results. Also, this is getting expensive! But we do really feel bad for her mainly because she has to go out so often and can no longer be left out of her crate. Thank you for all of your suggestions!

Renal failure causes my cat to over drink.
Check your pet food ingredients, they may have changed the formulation. Not that I think that's the cause here, but feeding the same food for years doesntmean the manufacturer hasn't changed it.

Absolutley check for diabetes. I would be shocked your vet hasnt done this already.

I think as a pet owner, you need to ask your vet for a referral to an internist. At this point, your vet doesn't know whats going on - why waste your money on tests that may not be needed. Ask them for the referral, they should absolutley support this. The internist should be able to review all your bloodwork and history, maybe do more tests/maybe not. Its worth the consult fee to get a specialists opinion. Doesn't mean you necessarily have to commit to doing further workup. There are lots of endocrine diseases and pathologies that regular vets just simply can't workup.

An example of this is atypial cushings. Adrenal hyperplasia, or other adrenal pathologies can not be palpated or detected by routine bloodwork, neither can something like ADH levels, but can cause PU/PD symptoms. Not diagnosing your dog here, but simply suggesting you get an internists opinion